DECLARE @UnitPrice MONEY = 12345.6789
SELECT FORMAT(@UnitPrice, 'C0', 'en-US')
what is the output of above statement?

The "C" (or currency) format specifier converts a number to a string that represents a currency amount. The precision specifier indicates the desired number of decimal places in the result string. If the precision specifier is omitted, the default precision is used for the specified culture. If the value to be formatted has more than the specified or default number of decimal places, the fractional value is rounded in the result string.